diff mbox series

[v3,1/3] vdpa: Add SetSteeringEBPF method for NetClientState

Message ID 30509e3c3b07bcadd95d5932aeb16820cb022902.1693299194.git.yin31149@gmail.com (mailing list archive)
State New, archived
Headers show
Series Vhost-vdpa Shadow Virtqueue RSS Support | expand

Commit Message

Hawkins Jiawei Aug. 29, 2023, 9:11 a.m. UTC
At present, to enable the VIRTIO_NET_F_RSS feature, eBPF must
be loaded for the vhost backend.

Given that vhost-vdpa is one of the vhost backend, we need to
implement the SetSteeringEBPF method to support RSS for vhost-vdpa,
even if vhost-vdpa calculates the rss hash in the hardware device
instead of in the kernel by eBPF.

Although this requires QEMU to be compiled with `--enable-bpf`
configuration even if the vdpa device does not use eBPF to
calculate the rss hash, this can avoid adding the specific
conditional statements for vDPA case to enable the VIRTIO_NET_F_RSS
feature, which reduces code maintainbility.

Suggested-by: Eugenio PĂ©rez <eperezma@redhat.com>
Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
---
 net/vhost-vdpa.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index b29f84f54c..11f89e7032 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -238,6 +238,12 @@  static void vhost_vdpa_cleanup(NetClientState *nc)
     }
 }
 
+/** Dummy SetSteeringEBPF to support RSS for vhost-vdpa backend  */
+static bool vhost_vdpa_set_steering_ebpf(NetClientState *nc, int prog_fd)
+{
+    return true;
+}
+
 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
 {
     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
@@ -400,6 +406,7 @@  static NetClientInfo net_vhost_vdpa_info = {
         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
         .has_ufo = vhost_vdpa_has_ufo,
         .check_peer_type = vhost_vdpa_check_peer_type,
+        .set_steering_ebpf = vhost_vdpa_set_steering_ebpf,
 };
 
 static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index,
@@ -1241,6 +1248,7 @@  static NetClientInfo net_vhost_vdpa_cvq_info = {
     .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
     .has_ufo = vhost_vdpa_has_ufo,
     .check_peer_type = vhost_vdpa_check_peer_type,
+    .set_steering_ebpf = vhost_vdpa_set_steering_ebpf,
 };
 
 /*